County profile · official public datasets

Kay County, OK

419 public highway bridges tracked in the FHWA National Bridge Inventory: 30.3% rated Good, 63.7% Fair, 6% Poor.

419
Public bridges
30.3%
Good condition
6%
Poor condition

The verdict

According to the Federal Highway Administration's 2024 National Bridge Inventory.

Kay County posts a better-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.

Top 43%
lowest Poor share in state
6%
Poor-condition share
419
public highway bridges
1979
avg year built

Poor is an FHWA condition category from the lowest applicable component rating (4 or below), not a live crossing-safety or closure decision. Rankings cover counties with at least five public highway bridges.

Kay County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Kay County ranks #33 of 77 Oklahoma counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 6%). Kay County, Oklahoma contains 419 public highway bridges. Roughly 30.3% are rated “Good,” 63.7% “Fair,” and 6% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.

Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

Total bridges

419

Public highway bridges in Kay County

Good condition

30.3%

127 of 419 rated 7-9

Fair condition

63.7%

267 of 419 rated 5-6

Poor condition

6%

25 of 419 rated 4 or below

In-state Poor-share rank

#33 of 77

Among Oklahoma counties with 5+ bridges, lower share ranks better

Condition distribution

Share of 419 NBI-tracked bridges by lowest applicable component rating.

Good
30.3% (127)
Fair
63.7% (267)
Poor
6% (25)

Kay County's Poor-condition bridges carry 14,592 vehicle crossings a day

That is 2.5% of the county's reported daily bridge traffic on 6% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 584 crossings a day against 1,706 for a Good-condition one. A Poor rating is a condition category, not a closure or a live safety judgement; it means the lowest applicable component rating is 4 or below.

Computed over the 419 of 419 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

48.7% of Kay County's bridges have passed the 50-year mark

204 of the 419 bridges with a recorded construction year were built in 1974 or earlier. Age alone is not a defect: a well-maintained older bridge can rate Good, and 30.3% of this county's inventory does. Even so, this older cohort is the population from which future Poor ratings are drawn, which is why the age profile below matters alongside the condition split above.

Cutoff derives from the 2024 release year minus a 50-year design life. Source: FHWA National Bridge Inventory, 2024 release.

One structure carries 23.3% of the county's Poor-condition bridge traffic

U.S. 60 over CHIKASKIA RIVER, built 1973, carries 3,400 vehicles a day, the most of any Poor-rated structure here. The county's Poor-condition exposure is concentrated rather than evenly spread, so the 25-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 14,592 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Kay County's bridges were built

419 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 2010s, when 82 of the county's bridges still in the inventory were built, which is 19.6% of those with a recorded year. That cohort is now 5 to 14 years old in the 2024 inventory. Its average build year (1979) matches the Oklahoma average (1977).

Source FHWA National Bridge Inventory (year built) As of 2024 NBI release

How Kay County compares with Oklahoma's closest counties by inventory size

The 5 Oklahoma counties nearest Kay County in number of bridges, with their condition splits. Its 6% Poor share is the 1st-lowest of these 6. Its average build year of 1979 against a peer-group mean of 1975 is in line with the group.

Showing the 5 closest of 76 Oklahoma counties eligible for comparison.

Bridge inventory size and condition shares for Kay County and the 5 Oklahoma counties closest to it in inventory size
County Bridges Poor
Caddo County 424 12.5%
Kay County (this page) 419 6%
Pittsburg County 411 7.8%
Pottawatomie County 408 6.4%
Muskogee County 398 10.1%
Creek County 395 20.8%

Each share is of that county's own total tracked bridges; peers are the counties with 5 or more bridges whose inventory size is closest to Kay County's. Source: FHWA National Bridge Inventory, 2024 release.

Nationwide counties with similar inventory size or average build year

Two NBI-derived peer sets for Kay County, both outside Oklahoma so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside OK (419 bridges here).

Similar average build year

Nearest mean year-built outside OK (1979 here).

Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.

All 419 Good 127 Fair 267 Poor 25

Good-condition bridges (127)

IRR E0180

Good

Over: BOIS DARC CREEK

4S 3.2W of KILDARE, Kay, OK

Built 2018 Load: 43.5 t ADT: 2,169

I-35 S.B.

Good

Over: B.N.G.R. R.R.

8.6 N JCT S.H. 11, Kay, OK

Built 2022 Load: 44.0 t ADT: 7,750

I-35 N.B.

Good

Over: A.T. & S.F. R.R.

8.6 N JCT S.H. 11, Kay, OK

Built 2023 Load: 44.0 t ADT: 7,750

N3450

Good

Over: CREEK

11.2E 5.3N OF NEW KIRK, Kay, OK

Built 2020 Load: 44.5 t ADT: 100

E0090

Good

Over: SWEETWATER CREEK

8.6E OF NEWKIRK, Kay, OK

Built 2020 Load: 44.5 t ADT: 200

U.S. 60

Good

Over: CREEK

0.1 MI E GRANT C/L, Kay, OK

Built 1927 Load: 45.1 t ADT: 1,500

E0080

Good

Over: CREEK

1.8S .2E OF BRAMAN, Kay, OK

Built 2021 Load: 45.4 t ADT: 24

E0080

Good

Over: DRY CREEK

6N 2.4W S.H.11/U.S.177, Kay, OK

Built 2021 Load: 45.4 t ADT: 75

E0100

Good

Over: DRY CREEK

2W 1S .8W OF SUMPTER, Kay, OK

Built 2021 Load: 46.3 t ADT: 24

I-35

Good

Over: SALT FK ARK RVR OFLOW

5.2 MI N NOBLE C/L, Kay, OK

Built 1975 Load: 47.2 t ADT: 8,750

I-35

Good

Over: SALT FK ARK RVR OFLOW

5.2 MI N NOBLE C/L, Kay, OK

Built 1975 Load: 47.2 t ADT: 8,750

E0170

Good

Over: EAST CATTLE CREEK

4W 3S .5W OF KILDARE, Kay, OK

Built 2022 Load: 47.2 t ADT: 50

N0330

Good

Over: BOIS DARC CREEK

4 W 2.3 N OF NEWKIRK, Kay, OK

Built 2023 Load: 47.2 t ADT: 38

E0207 L.A. CANN

Good

Over: CREEK

6.7S 1.1E OF KILDARE, Kay, OK

Built 2015 Load: 48.4 t ADT: 450

E0090

Good

Over: DRY CREEK

1.5 W OF SUMPTER, Kay, OK

Built 2021 Load: 49.0 t ADT: 75

N3320

Good

Over: CREEK

1.7E 4.2S OF SUMPTER, Kay, OK

Built 2022 Load: 49.0 t ADT: 75

E0110

Good

Over: BOIS DARC CREEK

3N 1.6W OF SH11/US77, Kay, OK

Built 2016 Load: 54.4 t ADT: 50

E0100

Good

Over: CREEK

1S 1.7W of NEWKIRK, Kay, OK

Built 2018 Load: 55.3 t ADT: 100

N3320

Good

Over: SPRING CREEK

2W .6N OF KILDARE, Kay, OK

Built 2017 Load: 59.0 t ADT: 50

IRR E0180

Good

Over: TURKEY CREEK

4S 3.2E OF KILDARE, Kay, OK

Built 2020 Load: 60.8 t ADT: 100

U.S. 60

Good

Over: CREEK

1.2 MI E JCT I 35, Kay, OK

Built 1969 Load: 64.5 t ADT: 4,500

E0030 3612C

Good

Over: BEAVER CREEK

.2S .2W OF HARDY, Kay, OK

Built 2016 Load: 65.3 t ADT: 24

N3140

Good

Over: CREEK

.5W 2.6S OF U.S. 177, Kay, OK

Built 2022 Load: 68.9 t ADT: 50

S.H. 156

Good

Over: COWSKIN CREEK

2.6 N NOBLE C/L, Kay, OK

Built 2023 Load: 69.1 t ADT: 930

E0120

Good

Over: CREEK

2S .1E OF NEWKIRK, Kay, OK

Built 2016 Load: 69.9 t ADT: 50

U.S. 77

Good

Over: CREEK

0.8 MI N JCT US 60, Kay, OK

Built 1951 Load: 90.7 t ADT: 10,100

U.S. 60

Good

Over: BOIS DARC CREEK OFLOW

12.8 MI E JCT I 35, Kay, OK

Built 1969 Load: 90.7 t ADT: 2,400

Read our methodology - how this data is sourced, computed, and verified.

Related

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Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.